| 7.20.1.A simple class hierarchy. |
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- A class that is inherited is called a base class.
- The inheriting class is called a derived class.
- A derived class is a specialized version of a base class.
- A derived class has all of the variables, methods, properties, operators, and indexers from the base class
- A derived class adds its own unique elements.
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The general form of a class declaration that inherits a base class: |
class derived-class-name : base-class-name {
// body of class
}
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Private members are not inherited. |
using System;
class Shape {
public double width;
public double height;
public void showDim() {
Console.WriteLine("Width and height are " +
width + " and " + height);
}
}
class Triangle : Shape {
public string style; // style of triangle
// Return area of triangle.
public double area() {
return width * height / 2;
}
// Display a triangle's style.
public void showStyle() {
Console.WriteLine("Triangle is " + style);
}
}
class MainClass {
public static void Main() {
Triangle t1 = new Triangle();
Triangle t2 = new Triangle();
t1.width = 4.0;
t1.height = 4.0;
t1.style = "isosceles";
t2.width = 8.0;
t2.height = 12.0;
t2.style = "right";
Console.WriteLine("Info for t1: ");
t1.showStyle();
t1.showDim();
Console.WriteLine("Area is " + t1.area());
Console.WriteLine();
Console.WriteLine("Info for t2: ");
t2.showStyle();
t2.showDim();
Console.WriteLine("Area is " + t2.area());
}
}
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Info for t1:
Triangle is isosceles
Width and height are 4 and 4
Area is 8
Info for t2:
Triangle is right
Width and height are 8 and 12
Area is 48 |